| 摘要 |
PCT No. PCT/DE94/00935 Sec. 371 Date Feb. 23, 1996 Sec. 102(e) Date Feb. 23, 1996 PCT Filed Aug. 16, 1994 PCT Pub. No. WO95/06321 PCT Pub. Date Mar. 2, 1995Contact material based on silver, use of such a contact material in a switching device in power engineering, and process for preparing the contact material. For contact pieces in low-voltage switches, in particular, substitute materials based on silver-iron oxide are proposed for the silver-nickel hitherto often used in practice. According to the invention, such a material contains, as a further effective component, an oxide of a metal of the third sub-group, yttrium oxide (Y2O3) being especially designed for this purpose. For example, a material of the composition Ag/Fe2O310/Y2O31 meets, with its favourable temperature behaviour, the properties required with respect to the contact property spectrum. In addition, at least one metal oxide which contains elements of the sixth sub-group of the Periodic Table of the Elements, preferably iron tungstate (FeWO4), can be present. In particular, a material of the composition Ag/Fe2O39/Y2O31/FeWO40.5 has shown good utility owing to its additionally improved welding and short-circuit behaviour.
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